||It is August of 1923 and the heat of the summer has turned London into a furnace. The recently engaged Honourable Daisy Dalrymple is invited to lunch by Lord John Frobisher, her brother-in-law, who has come to the city from his small village in Kent to attend to business. The business he's come to attend to, however, is very personal and very serious. It seems someone has been sending him a series of "poison pen" letters threatening to reveal an indiscretion of his youth--a revelation that would damage his marriage and position, and hurt those dearest to him. Unwilling to risk going to the proper authorities, Johnnie wants Daisy to come visit for a few days and see if she can quietly locate the person responsible.
With Belinda, her fiance's daughter, in tow, Daisy takes a few days away from her writing career to visit her sister and see what she can uncover. Soon enough it becomes apparent that this seemingly quiet village is a hotbed of intrigue and resentment. Besides her brother-in-law, other prominent residents are being terrorized by this anonymous letter writer, threatened with their most closely held secrets. Before Daisy can make any headway, a murder occurs and it seems clear that the malevolent writer of letters has taken his campaign to a new and deadly level. Now Daisy must ferret out the one responsible before one of her own family becomes the next victim.